Rapidly spinning compact stars with deconfinement phase transition

Tuna Demircik, Christian Ecker, Matti Järvinen

Research output: Contribution to journalArticlepeer-review

37 Scopus citations

Abstract

We study rapidly spinning compact stars with equations of state featuring a first-order phase transition between strongly coupled nuclear matter and deconfined quark matter by employing the gauge/gravity duality. We consider a family of models that allow purely hadronic uniformly rotating stars with masses up to approximately 2.9M, and are therefore compatible with the interpretation that the secondary component (2.59-0.09+0.08M) in GW190814 is a neutron star. These stars have central densities that are several times the nuclear saturation density, so that strong coupling and non-perturbative effects become crucial. We construct models where the maximal mass of static (rotating) stars MTOV(Mmax) is either determined by the secular instability or a phase-transition induced collapse. We find the largest values for Mmax/MTOVin cases where the phase transition determines Mmax, which shifts our fit result to = Mmax/MTOV= 1.227-0.016+0.031, a value slightly above the Breu-Rezzolla bound 1.203+0.022-0.022inferred from models without phase transition.

Original languageEnglish
Article numberL37
JournalAstrophysical Journal Letters
Volume907
Issue number2
DOIs
StatePublished - 1 Feb 2021

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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